My application has records. Records has categories. In edit record activity I need set category of record to Spinner by categoryId. I found solution like below:
for (int i = 0; i < spinner.getCount(); i++) {
Cursor value = (Cursor) spinner.getItemAtPosition(i);
long id = value.getLong(value.getColumnIndex("_id");
if (id == rowid) {
spinner.setSelection(i);
}
}
but it is a bad solution. It will be slow, because I do not have any amount limits for category in my application.
Do you have any solutions?
Thanks a lot!
Related
I'm populating a spinner with a number of records from my SQlite database using the following code:
DBHelper db = new DBHelper(getBaseContext());
Cursor cursor_clients = db.select("clients", "_id, name", "ORDER BY name"); // table, fields, filter/order
String[] columns = new String[] { "name" };
int[] to = new int[] { android.R.id.text1 };
SimpleCursorAdapter mAdapter = new SimpleCursorAdapter(this, android.R.layout.simple_spinner_item, cursor_clients, columns, to, 0);
mAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
Spinner spnClients = (Spinner) findViewById(R.id.spnClients);
spnClients.setAdapter(mAdapter);
It works great, and I can use
spnAcademias.getSelectedItemId();
To get the _id of the selected record. My problem is: How to select an item on this spinner by the _id?
I have the _id of the row I want, I want it to show this row selected, and not the first row coming from the query.
Doing more research I ended up with the solution here: setSelection on Spinner based on rowId
I thought maybe there was a native solution without a loop, but there is not.
Solution:
public void setSpinnerItemById(Spinner spinner, int _id)
{
int spinnerCount = spinner.getCount();
for (int i = 0; i < spinnerCount; i++)
{
Cursor value = (Cursor) spinner.getItemAtPosition(i);
long id = value.getLong(value.getColumnIndex("_id"));
if (id == _id)
{
spinner.setSelection(i);
break;
}
}
}
If you're able to just as easily get the text value of the row you are looking for, then try the solution here, and more specifically the top comment on it: Set selected item of spinner programmatically
Use the following: spinnerObject.setSelection(INDEX_OF_CATEGORY2).
...
... I also found a way of getting the index without needing to loop through the adapter. I used the following mySpinner.setSelection(arrayAdapter.getPosition("Category 2"));
I'm trying to save user information in my application. I have Employee number editText and Company EditText. My employee number is not a required field so that means my table can have null values. My problem is when I am comparing if the employee number entered by the user already exist in my database, it also reads the null values when the user do not enter anything on the employee number editText. Can anyone help me do this please?
This is my code where I save all the employee number in an arraylist and remove all the null values
ArrayList<String> employeenumber = databaseAdapter.getEmployeeNumber();
employeenumber.removeAll(Collections.singleton(null));
employeenumber.removeAll(Collections.singleton(""));
What I wanna do is, if the user enter employee number, it will check if the arraylist contains it and if yes, it will all check the company corresponds to it. I need to trap duplicate entry. For example the employee number is 1234 and the company is ABCD, the program must not accept it. Thanks for anyone who could help me.
First check whether the user enter something on employee number editText. Then use int flag to compare it. Try the code below in your main activity:
int flag1 = 0;
if (!Emp.equals(""))
{
ArrayList<String> CompanyandEmp = new ArrayList<String>();
CompanyandEmp = databaseAdapter.getCompanyEmp(Emp);
CompanyandEmp.removeAll(Collections.singleton(""));
for(int i=0;i< CompanyandEmp.size();i++)
{
String cmpemp = CompanyandEmp.get(i).toString();
if(cmpemp.equalsIgnoreCase(companyName))
{
flag1 = 1;
}
}
}
if (flag1 == 0)
{
//as per your requirement
}else{
Toast.makeText(RegistrationActivity.this, "Account info already exist.", Toast.LENGTH_LONG).show();
}
Then in your databaseAdapter:
public ArrayList<String> getCompanyEmp(String emp) {
SQLiteDatabase db = this.getReadableDatabase();
ArrayList<String> companyemp = new ArrayList<String>();
try {
Cursor c = db.query("select CompName FROM projsitemast where Emp='"+emp+"'", null);
if (c != null) {
c.moveToFirst();
for (int j = 0; j < c.getCount(); j++) {
companyemp.add(c.getString(0));
c.moveToNext();
}
c.close();
}
return companyemp;
} catch (Exception e) {
e.printStackTrace();
}
return companyemp;
}
Pretty sure this is an easy one, but i'm getting confused by all the examples that adapt the data returned from a cursor into different views. I just want to run a rawquery and put each item of data returned into a float array (so that i can add them up later). What do i need to use for this? Thanks
You'll still have a cursor when you query your database, but once you got the cursor you could iterate over it, pulling out the values you need into an array, like this:
DbAdapter db = new DbAdapter(mContext);
int columnIndex = 3; // Whichever column your float is in.
db.open();
Cursor cursor = db.getAllMyFloats();
float[] myFloats = new float[cursor.getCount()-1];
if (cursor.moveToFirst())
{
for (int i = 0; i < cursor.getCount(); i++)
{
myFloats[i] = cursor.getFloat(columnIndex);
cursor.moveToNext();
}
}
cursor.close();
db.close();
// Do what you want with myFloats[].
Don't minus by 1 in float[] myFloats = new float[cursor.getCount()-1]; because (int i =0) or i start from 0. If you use it, will appear Java.lang.IndexOutOfBoundsException. You need array index until [cursor.getCount()], not until [cursor.getCount()-1]. So the correct thing is float[] myFloats = new float[cursor.getCount()];
When i open Activity for EditRecord i want to select spinner row for adequate value in edited record
I find code like below, but its ok for few records in spinner, but when spinner.cursor contains many records i think its not right idea.
Is any other method to select spinner row for known rowid ?
Spinner spinner = (Spinner) findViewById(R.id.spinner);
spinner.setAdapter(new SimpleCursorAdapter(...));
for (int i = 0; i < spinner.getCount(); i++) {
Cursor value = (Cursor) spinner.getItemAtPosition(i);
long id = value.getLong(value.getColumnIndex("_id");
if (id == rowid) {
spinner.setSelection(i);
}
}
Why are you getting a cursor and looking p the column index every time? Simply do:
for (int i = 0; i < spinner.getCount(); i++) {
long id = spinner.getItemIdAtPosition(i);
if (id == rowid) {
spinner.setSelection(i);
}
}
I have created a simple Spinner binding it to a SimpleCursorAdapter. I'm populating the SimpleCursorAdapter with a list of towns from a content provider.
When I go to save the users selection I'm planning on saving the row id that is being populated into my SimpleCursorAdapter.
I'm using the following code to get the ID.
townSpinner.getSelectedItemId();
What I can not figure out is how best to set the selection when I pull back up the saved item.
The following code works but it only sets selection by position number.
townSpinner.setSelection(2);
Should I just create a loop to determine the correct position value based on Id?
long cityId = Long.parseLong(cursor.getString(CityQuery.CITY_ID));
for (int i = 0; i < citySpinner.getCount(); i++) {
long itemIdAtPosition2 = citySpinner.getItemIdAtPosition(i);
if (itemIdAtPosition2 == cityId) {
citySpinner.setSelection(i);
break;
}
}
I think you've answered your own question there!
Just write your own setSelectionByItemId method using the code you posted
Example:
DB:
public Cursor getData() {
SQLiteDatabase db = getReadableDatabase();
String sql = "select ID _id, Name from MyTable order by Name ";
Cursor c = db.rawQuery(sql, null);
c.moveToFirst();
return c;
}
Activity:
Cursor myCursor = db.getData();
SimpleCursorAdapter adapter1 = new SimpleCursorAdapter(
this,
android.R.layout.simple_spinner_item,
myCursor,
new String[] { "Name" }, new int[] { android.R.id.text1 }, 0);
adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mySpinner.setAdapter(adapter1);
for(int i = 0; i < adapter1.getCount(); i++)
{
if (adapter1.getItemId(i) == myID )
{
mySpinner.setSelection(i, false); //(false is optional)
break;
}
}
Android Spinner set Selected Item by Value
The spinner provides a way to set the selected valued based on the position using the setSelection(int position) method. Now to get the position based on a value you have to loop thru the spinner and get the position. Here is an example
mySpinner.setSelection(getIndex(mySpinner, myValue));
private int getIndex(Spinner spinner, String myString){
int index = 0;
for (int i=0;i<spinner.getCount();i++){
if (spinner.getItemAtPosition(i).equals(myString)){
index = i;
}
}
return index;
}
If you are using an ArrayList for your Spinner Adapter then you can use that to loop thru and get the index. Another way is is to loop thru the adapter entries
Spinner s = (Spinner) findViewById(R.id.spinner_id);
for(i=0; i < adapter.getCount(); i++) {
if(myString.trim().equals(adapter.getItem(i).toString())){
s.setSelection(i);
break;
}
}